Subsea desalination system for shallow water

1 . A shallow water desalination system comprising:

a subsea desalination template adapted to be located on a seabed, including at least one Reverse Osmosis (RO)-module zone, at least one RO-module connection and desalination template piping in fluid connection with the at least one RO-module connection;

at least one retrievable subsea RO-module adapted to be placed in the at least one RO-module zone of the subsea desalination template, the at least one retrievable subsea RO-module including a RO-template connection adapted to be connected to the at least one RO-module connection, and at least one RO-cartridge assembly ( 3 ) in fluid connection with the RO-template connection;

at least one seawater booster pump assembly with an inlet and an outlet adapted to be in fluid connection with a seawater inlet side of the at least one RO-cartridge assembly;

at least one retrievable subsea booster module including at the at least one seawater booster pump assembly;

at least one booster module template connection on the at least one retrievable subsea booster module, adapted to be connected to a booster module connection on a template with a booster module zone;

at least one desalinated water line adapted to convey desalinated water from the at least one retrievable subsea RO-module to a location above a sea level; and

a pressure regulator in fluid connection with a retentate side of the least one retrievable subsea RO-module.

2 . The shallow water desalination system of claim 1 , wherein the template with a booster module zone is the desalination template.

3 . The shallow water subsea desalination system of claim 1 , further including at least one desalinated water transport pump assembly in fluid connection with a desalinated water side of the at least one RO-cartridge assembly in the retrievable subsea RO-module.

4 . The shallow water desalination system of claim 3 , wherein the at least one seawater booster pump assembly and the at least one desalinated water transport pump assembly are located in the booster module.

5 . The shallow water desalination system of claim 3 , wherein the at least one desalinated water transport pump assembly is located in a retrievable subsea desalinated water transport module, and wherein the retrievable transport module is adapted to be located in a desalinated water transport module zone.

6 . The shallow water desalination system of claim 1 wherein the pressure regulator includes an energy recovery assembly.

7 . The shallow water desalination system of claim 6 , wherein the energy recovery assembly is located in a separate retrievable energy recovery module.

8 . The shallow water desalination system of claim 6 wherein the energy recovery assembly includes a turbine aggregate with a turbine and one of an electric generator and a mechanical connection through a transmission to the booster pump or the transport pump.

9 . The shallow water desalination system of claim 1 , further including at least one retrievable control module located in at least one control module zone on the desalination template.

10 . The shallow water desalination system of claim 1 , further including a prefilter assembly in a retrievable prefilter module upstream of the booster pump assembly.

11 . The shallow water desalination system of claim 10 , wherein the retrievable prefilter module includes a filter and is located on a separate filtering and pumping station, and wherein the booster module is located on the filtering and pumping station upstream and in fluid connection with the desalination template.

12 . The shallow water desalination system of claim 5 , wherein at least one separate pump template with the at least one transport module is located on a downstream side of the at least one subsea desalination template and includes a desalinated water inlet and a desalinated water outlet, whereby the separate pump template with the at least one transport module is adapted to convey the desalinated water from the desalination template.

13 . The shallow water desalination system of claim 5 , wherein at least one separate pump template with the at least one transport module is located on a downstream side of the at least one subsea desalination template and includes a desalinated water inlet and a desalinated water outlet, whereby the separate pump template with the at least one transport module is adapted to convey the desalinated water from the desalination template.

14 . The shallow water desalination system of claim 1 , further including a permanent seabed foundation secured to seabed anchoring elements, and wherein any of the subsea templates are adapted to be located on top of the permanent seabed foundation.

15 . The shallow water desalination system of claim 1 , wherein any of the subsea templates are adapted to be located on a further base template in fluid connection with the desalinated water pipeline and a concentrated seawater outlet.

16 . The shallow water desalination system of claim 15 , wherein the further subsea base template is adapted to be located on top of a permanent seabed foundation.

17 . A subsea desalination booster module for a desalination system, comprising:

at least one seawater booster pump assembly with an inlet and an outlet adapted to be in fluid connection with a seawater inlet side of at least one RO-cartridge assembly; and

at least one booster module template connection on the at least one retrievable subsea booster module, adapted to be connected to a booster module connection on a template with a booster module zone.